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About This Project

Smart boiler control via OpenTherm protocol using a Wemos D1 Mini. Integrates with MQTT and Home Assistant for zone-level heating control.

This comprehensive guide walks you through every step of the build — from sourcing components and assembling the PCB, to flashing firmware and integrating with Home Assistant via MQTT. All files (schematics, firmware source, documentation) are included in the download package.

Whether you're a seasoned IoT developer or tackling your first hardware project, the step-by-step format and detailed troubleshooting section ensure you'll be up and running in the estimated time.

Tech Stack Used

WemosOpenThermMQTT

Prerequisites

BEGINNER~4 hours estimated

Basic familiarity with ESP microcontrollers and WiFi networking recommended. No prior PCB assembly experience required.